My point is: If God doesn't want to give you a child of your own blood, why do you want to have one? May be, he will give you one in future after some years of prayer. It has happened many times in the church's history and it can happen to you.
Barrenness is a big cross and one must bear it in union with the Lord. It is also the great apportunity to adopt a child, a child that can be brought up by pagans who may deprive him of salvation.
Those children who live in bad situations are prone to many evils, everybody can kidnap them and take disadvantage of them in the most sinful ways.
Is it not beautiful to save a little angel from such great evils?